228 lines
8.4 KiB
Python
228 lines
8.4 KiB
Python
# DrCr: Web-based double-entry bookkeeping framework
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# Copyright (C) 2022–2023 Lee Yingtong Li (RunasSudo)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from drcr import AMOUNT_DPS
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from drcr.database import db
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from drcr.models import AccountConfiguration, Amount, Metadata, Transaction, TrialBalancer
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from drcr.reports import Calculated, Report, Section, Spacer, Subtotal, entries_for_kind
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from drcr.webapp import eofy_date, sofy_date
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from .tax_tables import base_tax, medicare_levy_threshold, repayment_rates, fbt_grossup
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def base_income_tax(year, taxable_income):
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"""Get the amount of base income tax"""
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for i, (upper_limit, flat_amount, marginal_rate) in enumerate(base_tax[year]):
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if upper_limit is None or taxable_income.quantity <= upper_limit * (10**AMOUNT_DPS):
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lower_limit = base_tax[year][i - 1][0] or 0
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return Amount(flat_amount * (10**AMOUNT_DPS) + marginal_rate * (taxable_income.quantity - lower_limit * (10**AMOUNT_DPS)), '$')
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def lito(taxable_income, total_tax):
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"""Get the amount of low income tax offset"""
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if taxable_income.quantity <= 3750000:
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# LITO is non-refundable
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# FIXME: This will not work if we implement multiple non-refundable tax offsets
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if total_tax.quantity <= 70000:
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return total_tax
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return Amount(70000, '$')
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if taxable_income.quantity <= 4500000:
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return Amount(70000 - 0.05 * (taxable_income.quantity - 3750000), '$')
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if taxable_income.quantity <= 6666700:
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return Amount(32500 - int(0.015 * (taxable_income.quantity - 4500000)), '$')
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return Amount(0, '$')
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def medicare_levy(year, taxable_income):
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lower_threshold, upper_threshold = medicare_levy_threshold[year]
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if taxable_income.quantity < lower_threshold * 100:
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return Amount(0, '$')
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if taxable_income.quantity < upper_threshold * 100:
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# Medicare levy is 10% of the amount above the lower threshold
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return Amount((taxable_income - lower_threshold * 100) * 0.1, '$')
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# Normal Medicare levy
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return Amount(int(taxable_income.quantity * 0.02), '$')
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def study_loan_repayment(year, taxable_income, rfb_grossedup):
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"""Get the amount of mandatory study loan repayment"""
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repayment_income = taxable_income + rfb_grossedup
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for upper_limit, rate in repayment_rates[year]:
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if upper_limit is None or repayment_income.quantity <= upper_limit * (10**AMOUNT_DPS):
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return Amount(rate * repayment_income.quantity, '$')
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def tax_summary_report():
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# Get trial balance
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balancer = TrialBalancer()
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balancer.apply_transactions(db.session.scalars(db.select(Transaction).where((Transaction.dt >= sofy_date()) & (Transaction.dt <= eofy_date())).options(db.selectinload(Transaction.postings))).all())
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accounts = dict(sorted(balancer.accounts.items()))
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# Get account configurations
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account_configurations = AccountConfiguration.get_all_kinds()
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report = Report(title='Tax summary')
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report.entries = [
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Section(
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entries=[
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Section(
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title='Salary or wages (1)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.income1', neg=True, floor=100) + [Subtotal('Total item 1', id='income1')],
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auto_hide=True
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),
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Spacer(),
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Section(
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title='Australian Government allowances and payments (5)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.income5', neg=True) + [Subtotal('Total item 5', id='income5', floor=100)],
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auto_hide=True
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),
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Spacer(),
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Section(
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title='Gross interest (10)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.income10', neg=True) + [Subtotal('Total item 10', id='income10', floor=100)],
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auto_hide=True
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),
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Spacer(),
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Section(
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title='Partnerships and trusts (13)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.income13', neg=True, floor=100) + [Subtotal('Total item 13', id='income13', floor=100)],
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auto_hide=True
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),
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Spacer(),
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#Section(
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# title='Net capital gains (18)',
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# entries=entries_for_kind(account_configurations, accounts, 'austax.income18', neg=True) + [Subtotal('Total item 18', id='income18', floor=100)]
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#),
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#Spacer(),
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Section(
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title='Foreign source income and foreign assets or property (20)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.income20', neg=True, floor=100) + [Subtotal('Total item 20', id='income20', floor=100)],
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auto_hide=True
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),
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Spacer(),
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Calculated(
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'Total assessable income',
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lambda r: r.by_id('income1').amount + r.by_id('income5').amount + r.by_id('income10').amount + r.by_id('income13').amount + r.by_id('income20').amount,
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id='assessable',
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heading=True,
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bordered=True
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),
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Spacer(),
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Section(
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title='Work-related travel expenses (D2)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.d2') + [Subtotal('Total item D2', id='d2', floor=100)],
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auto_hide=True
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),
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Spacer(),
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Section(
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title='Work-related self-education expenses (D4)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.d4') + [Subtotal('Total item D4', id='d4', floor=100)],
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auto_hide=True
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),
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Spacer(),
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Section(
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title='Other work-related expenses (D5)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.d5') + [Subtotal('Total item D5', id='d5', floor=100)],
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auto_hide=True
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),
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Spacer(),
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Section(
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title='Gifts or donations (D9)',
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entries=entries_for_kind(account_configurations, accounts, 'austax.d9') + [Subtotal('Total item D9', id='d9', floor=100)],
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auto_hide=True
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),
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Spacer(),
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Calculated(
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'Total deductions',
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lambda r: r.by_id('d2').amount + r.by_id('d4').amount + r.by_id('d5').amount + r.by_id('d9').amount,
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id='deductions',
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heading=True,
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bordered=True
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),
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Spacer(),
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Calculated(
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'Net taxable income',
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lambda r: r.by_id('assessable').amount - r.by_id('deductions').amount,
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id='taxable',
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heading=True,
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bordered=True
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),
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Spacer(),
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Section(
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entries=[
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Calculated(
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'Base income tax',
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lambda _: base_income_tax(eofy_date().year, report.by_id('taxable').amount)
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),
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Calculated(
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'Medicare levy',
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lambda _: medicare_levy(eofy_date().year, report.by_id('taxable').amount)
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),
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Subtotal('Total income tax', id='total_tax', bordered=True)
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]
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),
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Spacer(),
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Section(
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title='Tax offsets',
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entries=entries_for_kind(account_configurations, accounts, 'austax.offset', neg=True) + [
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Calculated('Low income tax offset', lambda _: lito(report.by_id('taxable').amount, report.by_id('total_tax').amount)),
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Subtotal('Total tax offsets', id='offsets')
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]
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),
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Spacer(),
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Section(
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entries=[
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Calculated(
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'Taxable value of reportable fringe benefits',
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lambda _: -sum((e.amount for e in entries_for_kind(account_configurations, accounts, 'austax.rfb')), Amount(0, '$')),
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id='rfb_taxable'
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),
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Calculated(
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'Grossed-up value',
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lambda _: Amount(report.by_id('rfb_taxable').amount.quantity * fbt_grossup[eofy_date().year], '$'),
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id='rfb_grossedup'
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),
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Calculated(
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'Mandatory study loan repayment',
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lambda _: study_loan_repayment(eofy_date().year, report.by_id('taxable').amount, report.by_id('rfb_grossedup').amount),
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id='loan_repayment',
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heading=True
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)
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]
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),
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Spacer(),
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Section(
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title='PAYG withheld amounts',
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entries=entries_for_kind(account_configurations, accounts, 'austax.paygw') + [Subtotal('Total withheld amounts', id='paygw')]
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),
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Spacer(),
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Calculated(
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'ATO liability payable (refundable)',
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lambda _: report.by_id('total_tax').amount - report.by_id('offsets').amount - report.by_id('paygw').amount + report.by_id('loan_repayment').amount,
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heading=True,
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bordered=True
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)
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]
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)
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]
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report.calculate()
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return report
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